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Q.
$\left( CH _{3}\right)_{4} \overset{+}N $ is neither an electrophile, nor a nucleophile because it
Organic Chemistry – Some Basic Principles and Techniques
Solution:
$\left( CH _{3}\right)_{4} N ^{+}$ has no electron pair available for donation to act as nucleophile. Valence shell of nitrogen is completely filled and has no scope for acceptance of extra electrons to act as electrophile.